Scroll-chuck.



No. 726,099. PATENTBD APR. 21, 1903. J. 0. POTTER & J. JOHNSTON.

SCROLL CHUCK.

APPLICATION FILED JUNE 20,1900,

N0 MODEL. 2 SHEETS-SHEET 1.

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PATENTEDQAPIR. 21, 1903.

No. 726,099. I

J. 0. POTTER & J. JOHNSTON;

SCROLL CHUCK.

APPLICATION FILED JUNE 20,1900.

7 N0 MODEL. 2 SHEETSSHEET 2.

a at a 7 INYENZ'EHEI UNITED STATES V PATENT OFFICE.

JAMES C. POTTER AND JOHN JOHNSTON, OF PAWTUCKET, RHODE ISLAND, AssIeNoRs o POTTER & JOHNSTON, MACHINE COMPANY, OF PAW- TUOKET, RI-IODE ISLAND, A CORPORATION or RHODE ISLAND.

scjRoLL- ci-lucm- SPECIFICATIQN formingpart Patent NO. 72 6,099, dated April 21, 1903. gpplioation filed June 20, 1900. Serial No. 20,965. (No model.)

T all whom/ immy concern; J I Be it known that we, 'J'AM'ESfO. POTTER, a citizen of the United States, and JOHN'JOHN- STON, a subject of the King of GreatBritain,

residing atPawtucket, in the county ofProvidence and State of Rhode Island, have invented a new and usefullm'provement in Scroll-Chucks, of which the following isa specification. 5

This invention has reference to an improvement in chucks used on lathes and otherma-' chines to secure the work.

' The invention is particularly applicable to spiral chucks in which the dogs are connected with a helically-grooved plate or ring;

The object of this invention is to provide a scroll-chuck with mechanism by which the dogs maybe operated to clamp or release the work without diminishing or arresting the rotation of thechuck or the machine.

To this end the invention consists in the peculiar and novel construction and the com bination of the parts whereby the dogs are simultaneously operated while the chuck con- 2 5 tinues to rotate,as will be morefully set forth hereinafter.

Figure l is a side'view-of our improved chuck. Fig. 2 is a front'view of the chuck, shown partly in section.

mechanism of one of the dogs bywhich the scroll-ring is operated while the chuck-rorates. Fig. lis a side view, partlyin section,

of the parts shown inFig. Fig; 5 is a ion gitudinal sectional view'onthe-line -X-X of Fig. 3.

Similar marks of reference indicate corresponding parts in all the figures.

In the drawin'gs, d-indicates the front body of chuck,and-a -aaradial.ways in which the dogs a a are supported and made to slide toward andfromth'e-center of the chuck. In the annular-groove a in the front-body a of the chuck the ringer/ is rotatably-supported. 5 Therin'g a/has on its vertical face the continuous helical grooves a into which corresponding projections on the dog enter, as is shown in Fig. 3. The ring 01, is of L-shaped cross-section, the member a forming an anthe three dogs.

Fig 3is a sectional 3o view on radial lines through the operating nular flange, the inner edge of which is formed into the bevei-gearai By rotating the ring a in onedire'cti on the dogs on a are all moved "in their ways toward the center of the chuck to grasp and hold the work, and when the ring a is rotated in the opposite direction the dogs are moved-away from the center to release the work, or vice versa.

Thebevel-pinion a engages with the bevelgear a on the annular rim of the ring a. The straight pinion a is on the same shaft with the bevel-pinion and preferably made in one piece withthe same. The journal-bearings 0, andct are journaled in bearings formed half inthe front part at and half in the rear part Lb of the chuck. Three of these compound pinions are preferably used, and they are located-preferably, in the rear of each of I They may, however, be 10- cated'at other points of the circumferential surface of the chuck,'and'for some work a chuck having only one of the compound pinjions may be constructed and practically used. The shafts of .thecompound pinions are each provided with the wrench-stud 0.

The rear part b of the chuck is secured to the front part at by means of the screws b b.

Thepart b has'the' recesses-b b for the com -poundpinions. =The forward-projecting annular' flange 19 forms a substantial support for'jthe-forward. part a. The sleeve 11 is in= ternally'screw-th'readed tO COHDQCD with the end of the arbor of th'elathe or other machine. The sleeve'b extends over the arbor and-forms the. bearing of the shipper-sleeve b In the bodyfof the sleeve tangential to the pinion or pinions a the hole or holes I) are made to formways inwhich the rack-bars b slide, the rack b of which engages with the pinions ta ;The pin 19 extends through the slot b and connects the barb 'withtheshipper-sleeve b In the drawings the parts are shown in the positions -they occupy when the work is clamped by the dogs. When now the work is to be released, the shipper-sleeve b is operated by the usual shipper-lever to slide the rack bar or bars b rearward. The rack 11* rotates the pinion a and with it the bevelpinion a which being engaged with the bevel-gear of on the ring a rotates the ring and by means of the helical grooves on the face of the ring a in engagement with the grooved back of the dogs moves the dogs a simultaneously away from the work sufliciently to release the work without stopping the chuck. The reverse movement of the shipper-sleeve returns the rack-bars b to the position shown in the drawings, and in so doing operates the ring a through the compound pinions, to force the dogs against the work without stopping the rotation of the chuck.

By the construction herein shown and described all the parts are readily accessible by separating the front part a from the rear part b of the chuck, and all the operative parts are firmly supported on the rear part of the chuck, which is secured on the arbor of the machine.

Our improved chuck combines the facility of securing and releasing the work, while the chuck rotates with structural strength and clamping power.

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1. In a chuck, the combination of a part having helical grooves, dogs engaging with said grooves, an annular gear on said part, a rack-bar sliding in ways parallel with the axial center of the chuck, a pinion engaging with the rack-bar, a pinion fixed to the first pinion engaging with said annular gear of the helically-grooved part, and means for operating the rack-bar, whereby the dogs may be operated to clamp or release the work.

2. In a chuck, the combination of a body having guideways, dogs in the latter, a ring mounted on the head having helical grooves on one face to engage grooves in the backs of the dogs, and on its opposite face having a circular rack, a shaft mounted on the head having two pinions, one of which engages said circular rack, and a straight rack sliding in a way in the head parallel to the chuckaxis.

3. In a chuck, the combination of dogs mounted in radial ways and having grooves in their backs, a ring having helical grooves that engage with the dogs, a bevel-gear on the ring, a plurality of bevel-pinions engaging with the gear on the ring, a spur-gear pinion fixed to each of the bevel-pinions, a rack-bar in engagement with each spur-gear pinion, and a shipper-sleeve connected with all of the rack-bars whereby power is transmitted through the rack-bars and pinions to the helically-grooved ring at a plurality of points to actuate the dogs.

4. In a chuck, the combination of a scroll for operating the jaws, a circular rack attached to said scroll, a pinion for operating said circular rack, a straight rack for operating said pinion, and a shipper-sleeve connected to said straight rack, said racks and pinions being entirely inclosed, substantially as and for the purpose described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JAMES C. POTTER. JOHN JOHNSTON.

Witnesses:

J. A. MILLER, Jr., A. E. HAGERTY. 

